Germany’s health ministry told the BBC a US citizen was being taken to the country for treatment.
The US Centers for Disease Control and Prevention (CDC) said it was working to evacuate at least six other Americans who were exposed.
The WHO and other agencies are working with governments and communities to try to stop the spread of the virus, urging residents to follow preventative measures and report to the nearest health facility if they experience any symptoms.
What is Ebola and how does it spread?
Ebola is caused by a virus and initially causes symptoms similar to the flu, with fever, headache and tiredness.
As the disease progresses, vomiting and diarrhoea develop and it can lead to organ failure. Some, but not all, patients develop internal and external bleeding.
The virus spreads from one person to another by contact with infected bodily fluids such as blood or vomit.
The Bundibugyo strain fueling this rise in cases is rare, and has previously only caused two outbreaks, when it killed about a third of those infected.
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